Still trying to fight off the o2 sensor codes
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Rock Crawling
Joined: Jan 2012
Posts: 498
Likes: 20
From: Belton, TX
Still trying to fight off the o2 sensor codes
I was getting sensor 2 codes but replaced both upstream sensors. Now Im getting 0130, 0135, 0155 and 0150 codes all relating to the downstream sensors. With these codes should I replace the 2 downstream sensors or is there something else going on? Thanx for any help.
Mudding
Joined: Jun 2012
Posts: 116
Likes: 1
I know I had codes for the pre cat o2's and replaced them. From what I have read on here the downstream ones are not that important for you just te environment because they are for emissions. I would not care if the downstream ones went bad I would leave them. I did notice a difference with my Idle replacing the upstreams.
TReK
Joined: Mar 2012
Posts: 3,171
Likes: 45
replace both downstreams now too.
The ECU looks at the readings from the upstreams and the downstreams to
determine the condition of your CAT convertor.
The CARB and others want the CATs to scrub and burn bad stuff out of the exhaust stream.
So, now that the front O2's are working you will need to work the back O2's.
You can see some readings on the rear O2's on this page:
1997 Land Rover replace catalytic converter and head gaskets
Some of the pictures have readings on the Rear o2s
The ECU looks at the readings from the upstreams and the downstreams to
determine the condition of your CAT convertor.
The CARB and others want the CATs to scrub and burn bad stuff out of the exhaust stream.
So, now that the front O2's are working you will need to work the back O2's.
You can see some readings on the rear O2's on this page:
1997 Land Rover replace catalytic converter and head gaskets
Some of the pictures have readings on the Rear o2s
Yes upstream and down stream sensors are the same.
The downstream ones only tell you if the cats are working or not, they have zero to do with engine fueling or run problems.
If the cats are out of range or the O2's are dead they will throw a code, depending on the code will determine your course of action.
If you still have your old front O2's then throw those in, clear the codes and see what happens.
The downstream ones only tell you if the cats are working or not, they have zero to do with engine fueling or run problems.
If the cats are out of range or the O2's are dead they will throw a code, depending on the code will determine your course of action.
If you still have your old front O2's then throw those in, clear the codes and see what happens.
On the DI the fronts and rears are exactly the same, on the DII they are not.
I always forget that.
Administrator
Joined: Apr 2006
Posts: 25,707
Likes: 107
From: Denver, Colorado
If you are4 at 100,000 miles or more, you should replace all 4 02 sensors and make sure you clean the connections for the front 02's cause they are prone to getting oil in them from leaking valve cover gaskets.